#include<stdio.h>20
int pd(int year)
{
	if(year%4==0&&year%100!=0)
	return 1;
	else
	return 0;
}
int main()
{
	int year;
scanf("%d",&year); 
	if(pd(year)==1)
	{
		printf("是闰年");
	}
	else
	printf("不是闰年");
}
